A new cable fault location method based on wavelet reconstruction is proposed. In this method the difference between the currents of faulty phase and sound phase under the high voltage pulse excitation is used as the measured signal and is decomposed in multi-scale by wavelet transform, then reconstructed in single scale. Comparing with traditional fault location method by travelling wave, the presented method will not be interfered by the reflected wave from the branch joint of cables or from other positions where the impedances are not matched and not be influenced by fault types, otherwise, the reflected waves can be recognized even the faulty position is near to the measuring terminal, at the same time, the influence of the wave speed uncertainty can be reduced. The correctness of the proposed method is proved by simulation results.
标签： method reconstruction location proposed
上传时间： 2016-02-04
上传用户：maizezhen
几种常用的压缩算法 本程序包含以下功能： 1、 Arithmetic coding 2、 Huffman coding 3、 LZ77 coding 4、 LZ78 coding 5、 LZW 6、 RLE 7、 DCT 8、 Furie transform
标签： coding Arithmetic Huffman LZ
上传时间： 2014-01-18
上传用户：caozhizhi
the attached utility is a work I ve submitted to the university It shows what a jpeg compression is all about. the function implements the DCT transform, using a matrix operator. note that matlab has a function for the DCT and iDCT transforms that might be more efficient.
标签： compression university the submitted
上传时间： 2014-01-15
上传用户：Altman
Hilber-Huang变换的MATLAB程序 Mat_emd is a Matlab program demonstrating performing the Empirical Mode Decomposition and Hilbert-Huang transform on seismic reflection data
标签： demonstrating Hilber-Huang performing Empirical
上传时间： 2016-04-03
上传用户：zhangyigenius
Image Compression A collection of simple routines for image compression using different techniques. 图象压缩的不同方法 BTCODE: Image compression Using Block Truncation Coding. PYRAMID: Image compression based on Gaussian Pyramids. DCTCOMPR: Image compression based on Discrete Cosine transform. IMCOMPR: Image compression based on Singular Value Decomposition. The given codes can be also used in 2D noise suppression. Notes: The function "conv2fft" performs a 2D FFT-based convolution. Type "help conv2fft" on Matlab command window for more informations.
标签： Compression compression collection different
上传时间： 2016-05-11
上传用户：磊子226
用Fourier变换求取信号的功率谱---周期图法 用Fourier变换求取信号的功率谱---分段周期图法 用Fourier变换求取信号的功率谱---welch方法 功率谱估计----多窗口法（multitaper method ,MTM法） 功率谱估计----最大熵法（maxmum entmpy method,MEM法） 功率谱估计----多信号分类法（multiple signal classification,music法）Fourier transform to strike a signal to the power spectrum - the cycle of plans Fourier transform to strike a signal to the power spectrum - Sub-cycle Method Fourier transform to strike a signal to the power spectrum --- welch method Power spectrum estimated more than window ---- Law (multitaper method, MTM) ---- Power spectrum estimate of maximum entropy (maxmum entmpy method, MEM) ---- More than the estimated power spectrum signal classification (multiple signal classification, music)
上传时间： 2016-07-16
上传用户：wqxstar
fft.c--This computes an in-place complex-to-complex FFT x and y are the real and imaginary arrays of 2^m points. dir = 1 gives forward transform dir = -1 gives reverse transform
标签： complex-to-complex and imaginary computes
上传时间： 2016-09-17
上传用户：ljt101007
This computes an in-place complex-to-complex FFT x and y are the real and imaginary arrays of 2^m points. dir = 1 gives forward transform dir = -1 gives reverse transform
标签： complex-to-complex and imaginary computes
上传时间： 2013-12-18
上传用户：huql11633
The tca package is a Matlab program that implements the tree-dependent component analysis (TCA) algorithms that extends the independent component analysis (ICA), where instead of looking for a linear transform that makes the data components independent, we are looking for components that can be best fitted in a tree structured graphical model. The TCA model can be applied in any situation where the data can be assumed to have been transformed by an unknown linear transformation.
标签： tree-dependent implements component analysis
上传时间： 2016-09-17
上传用户：cazjing
1D FDTD simulation between free space and dielectric medium with absorbing boundary conditions,calculating the fourier transform of electric field
标签： simulation dielectric conditions absorbing
上传时间： 2016-09-24
上传用户：gundamwzc
